Dial test-indicator.



F. ZAHORIK.

DIAL TEST INDICATOR. APPLICATION FILED JULY 23,'I9I4.

I l 1 52,686. Patented Sept. 7, 1915 COLUMBIA PLANuuRAI'H CCL.wASHxNnTDN, D. C.

, ject of Austria,

- line 2-2 of Fig. 1.

NETE@ DIAL rnsnrnnicaron. f

To all whom, 'it may concern j n Beit known that I, FRANK ZAHQRIK, subc-`residing at Racine, inthe county of Racine, Stateof lisconsin, haveinvented certain new `and useful Improve ments in Dial Test-Indicators;and I do hereby declare the followingto be a full, clear, and exactdescription of the invention, such as will enable othersskilled in theart to which it appertains to make and use the same. y f

This invention relates to ymeasuring instruments and has specialreference to a dial test indicator.

The principal object of the invention is to improve and simplify theconstruction of devices of this character. y

A second object of the invention is to provide,

` lVith the above and other objects in view the invention consists ingeneral of certain novel details of construction and combination ofparts hereinafter fully described, illustrated in the accompanyingdrawings, and specifically claimed.

In the accompanying drawings, like characters of reference indicate likeparts in the several views, and Figure 1, is a face view of the deviceconstructed in accordance with this invention. Fig. 2, is a section onthe Fig. 3, is a view similar to Fig. 1 but with the dial removed andthe casing broken away to show the operating parts. Fig. 4 is a sectionon the line 4-4 of Fig. 3.

In carrying out the objects of this invention there is provided a case10 having mounted thereon a ring 11 which is so arranged as to rotate onthe casing. This ring 11 carries a dial 12 provided with graduations 13,each of these graduations preferably indicating one Aone-thousandth ofan inch. The usual watch crystal 14 covers the dial' and protectstheparts from dust. j

Fixed to the bottom of the casing is a bearing 15 for the staff 16 of apinion 17. This staff extends through the dial and carries on its outerend a hand or pointer 18 which traverses the dial as the pinion isyrotated. Extending from the side ofthe casing is a tubular projection 19wherein is mounted a spindle 20, the spindle having a head 21 providedwith a beveled end 22. One side of the head is flattened at 23 and bearslSpecification ofLetters Patent. i Animation iedfnuyfzs, 1914. serialNo. 852,742.

in a device of this character means for preventing back lash in thegearing used.

` rateateuscpe. fz, isis.

l against the fbottom'of the casing to prevent the rotation ofthe'spindle and this holds thebeveledface in proper position. Mountedwithin thecasing is a staffl v24 carrying a lever'arm 25 provided with ahead 26 which engages the beveled end of the head 22. j

This stad 24 carries a secondarm 27 supporting at its end asegmentalgear28 which.y

meshes with the pinion 17. A short arm 29 also projects from the staff24 and is connected byka sprmg 30 to a pin 31 within r`the casing.

Now when the spindle 20 is forced inward this will cause movement of thegear 28 and consequently rotation of the pinion 17 so that the hand 18will traverse the dial.

Owing to the beveled face 22 the movement of the hand will correspondcorrectly to the inward movement of the spindle 20 with the exception ofthe lost motion between the gear and pinion, the bevel being properlyarranged to this end. The spring 30 will,`

of course, return the parts when pressure on the spindle 2O is relaxed.

In order to prevent the lost motion above referred to there is pivotedwithin the casing a second lever 32 carrying at its end a segmental gear33 which meshes with the pinion 17 on the side opposite the gear 28. Asecond spring 34 is employed to hold the lever 32 in such a position asto cause constant engagement of the teeth on the gear 33 with the yteethof the pinion 17. In order to proj videfor the lever 32 the casing isprovided withy an extension 35 and this extension carries at one end abearing 36 for a spindle 37, the latter being arranged at right anglesto the spindle 20. This spindle is shouldered within the casing and therounded end 38 of the lever 32 rests on this shoulder. Both spindles areprovided with threaded sockets for the reception of the threaded stems39 of contact points 40 the latter being of any desired shape. Now, ifeither ofthe spindles be forced in the spring controlled remainingspindle will be tensioned so that there will be no lost motion or backlash in the gearing.

Inuse the dial can be rotated to bring the zero point beneath the end ofthe hand wheneverk desired the measurements being started from suchpositions. Furthermore a suit able ear 41 is providedon the back of thecasing for attachment of the device to any support.

There has thus been provided a simple ir tion to the exact Vio andeflicient device of the kind describedand of the character specified. YY

It Will he obvious thatV many minor changes may be made iii the form andcon- Vstruction of this invention Without depart,-

ing from the material principles thereof;V It is not therefore desiredto confine the invendescribed, but it is wished to include all such ascome properly lWithin the scope'claimed.

i `is claimed as neW'is: f

In a measuring instrument of the kind dea pinion 'on scribed, Y,a handcarryingy staff,

said pinion said staff, gears meshing with Copies of this patent may beobtained forive cents'eachby addressing the Commissioner of Patents,

form herein shown and heingprovided with a beveled acearranged of thehell-crank to engage the other arm to rock the same When said spindle isrecip# rocated. y Y

In testimony whereof I afHX my signature,

, inthe presence of two Witnesses; n

' Y. FRANK zAHoRiK.V p

Vitnesses: l Y F. HERMES, Louis/P. MONK.'

Washingtoinjl),Y C,

